body {
    background-color: #333333;
    color: #333333;
}

canvas {
    border: 1px solid #000000;
    background-color: #f1f1f1;
    padding-left: 0;
    padding-right: 0;
    margin-top: 30px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

button {
    background-color: #f44336;
  	border: none;
  	color: white;
  	padding: 10px 0px;
  	margin-top: 30px;
  	margin-left: 40%;
    margin-right: 40%;
    width: 20%;
  	text-align: center;
  	text-decoration: none;
  	display: inline-block;
  	font-size: 16px;
}
